Improved U Values - Structural Forms.

Approved Document Part L embraces significant changes to the insulation requirements of the building fabric that will impact on the use of fuel and power.

The intended reduction in the  U values of both roofs and walls is detailed  below.

As a consequence of the above, the insulation thickness in either composite, glass fibre or rock fibre cladding systems will significantly increase.This will have an effect on the dead load that is applied to the supporting structure, and could result in some nominal increases in section sizes of the primary and secondary steelwork of the building.

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